MPs with the most lucrative earnings from jobs outside of politics contribute to fewer parliamentary debates, are absent for more votes and submit fewer written questions than other Members of Parliament, a new report suggests.

The research, which examined the activities of Britain’s 20
top-earning MPs, was conducted by Ed Miliband's opposition Labour
Party.

The report reveals these high-earning politicians have
participated in 22 percent fewer debates than their parliamentary
peers since March 2014.

It indicated that Britain’s top-earning MPs tendered almost 40
percent fewer written questions than their colleagues who do not
have second jobs.

Additionally, the high-earning MPs failed to turn up for 373
votes on average – a 7 percent higher absentee rate than their
parliamentary colleagues, the report said.

The 20 politicians who earn the highest amount from roles outside
of their parliamentary duties are predominantly Conservative
Party MPs, the research revealed.

While 16 are Tories, one is Labour and one is a Liberal Democrat.
Second salaries ranged from £87,500 to £452,545, the report said.

The top four earning MPs with second jobs were three Conservative
Party MPs who happen to be barristers: Geoffrey Cox QC, Sir
Edward Garnier QC and Stephen Phillips QC.

The fourth is Labour’s former leader and ex-PM Gordon Brown,
whose second salary amounts to £390,157. Geoffrey Cox is the top
earner with a second salary of £452,545.

Reflecting on the research, a Conservative Party source told the
Guardian: “There is more to representing
constituents than sitting in Westminster submitting endless
written questions and enjoying the sound of your own voice.”

“All the same, it’s good that Labour finally want to draw
attention to Gordon Brown’s contemptible failure to turn up
during this parliament.”

Brown told the paper, however, his outside earnings bring him no
personal gain and are either channeled directly to charity or
towards the financing of his and his spouses “ongoing
involvement in public life.”

The report’s release follows Labour chief Ed Miliband’s call for
an outright ban on MPs holding consultancies and directorships,
as well as a cap on MPs’ second salaries.

It was sparked by the release of a secret film showing ex-Foreign
Secretaries Jack Straw and Malcolm Rikfind discussing how they
could use their political stature to aid a fictitious Chinese
firm in exchange for cash.

Straw and Rifkind, both former foreign secretaries, were duped by
reporters from the Daily Telegraph and Channel 4. The undercover
journalists posed as the fake firm's staff, looking to gain
access to politicians and senior establishment figures.

Rifkind stepped down as chairman of the Intelligence and Security
Committee and resigned as an MP after the scandal broke.

Both men have now reported themselves to the Parliamentary
Standards Committee, with Straw saying he had fallen into a
“very clever trap” and Rifkind acknowledging his
comments had been “silly.”

Sheila Gilmore, Labour MP for Edinburgh East and a member of the
Public Administration Select Committee, said Prime Minister David
Cameron is “defending a broken system.”

“All MPs should focus on their constituents’ interests, not
their own,” she said.

“David Cameron is
once again failing to stand with working people who want to see
change. We have a chance to restore trust in politics, but David
Cameron is failing to take action.”